/Engine/Source/Runtime/MovieScene/Public/MovieSceneKeyProxy.h
Implementation function that sets the underlying key time/value to the specified values if possible. If the section is locked, InOutValue and InOutTime will be reset back to the current key's value
template<typename ChannelType, typename ValueType> void OnProxyValueChanged ( [TMovieSceneChannelHandle](API\Runtime\MovieScene\Channels\TMovieSceneChannelHandle)< ChannelType > InChannelHandle, [UMovieSceneSection](API\Runtime\MovieScene\UMovieSceneSection) * InSection, [FKeyHandle](API\Runtime\Engine\Curves\FKeyHandle) InKeyHandle, ValueType & InOutValue, [FFrameNumber](API\Runtime\Core\Misc\FFrameNumber) & InOutTime )